240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

FI issues

Old 01-07-2008, 11:53 AM
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FI issues

OK, I have a 78 280z, when I start it up, it seems to idle ok, but when I press down on the gas, it bogs down to point of almost shutting off, or if it can get above 2500 rpms the motor sound ok but there doesnt seem to be any exhaust being released at all, anybody......... Not sure what to do, could it be the AFM?
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Old 01-07-2008, 12:00 PM
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Welcome to ZDriver!

Did you recently wash the engine bay? Have you checked the timing & efi connections?
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Old 01-07-2008, 10:07 PM
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do a back pressure test you may have a plugged up cat
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Old 01-07-2008, 10:20 PM
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Yeah, you should check the catalytic converter
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Old 01-08-2008, 11:03 AM
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Cat is clear and connections are good, im lost...
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Old 01-08-2008, 11:04 AM
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Arg... the cat is not the prob. Did you see this?

Originally Posted by NismoPick
Welcome to ZDriver!

Did you recently wash the engine bay? Have you checked the timing & efi connections?
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Old 01-08-2008, 11:21 AM
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No I havn't washed the engine bay and EFI connections are good, and timing is right on, no I have begun to blow white smoke out of the tail pipe
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Old 01-08-2008, 11:24 AM
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Originally Posted by Zfanattic86
no I have begun to blow white smoke out of the tail pipe
White smoke = burning coolant.
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Old 01-08-2008, 07:54 PM
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Blown head gasket? maybe fuel pump's going out? prob not but thats what mine did. might be afm cept i dont think it would idle right then. I'm only sixteen though just givin some thought.
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Old 01-08-2008, 09:18 PM
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Ok turns out my timing was about 1 degree off, and valves were a little out of whack, adjusting timing and valves back to where they should be at. Pulled off distributor because bolt had snapped. I drilled out the bolt, and replaced it, put distributor back in and tried to fire it up and it wont. I then thout maybe I had flooded the engine and removed the in fuel line from the rail and turned it over it started right up, then ran untill the fuel was gone from the rail, i put line bak on and it wont start, take off and it starts. Now im really lost, because that doesnt make any sense to me. And my return line flows normal. Anybody, because Im at a loss here........
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Old 01-08-2008, 09:31 PM
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Originally Posted by Zfanattic86
and removed the in fuel line from the rail and turned it over it started right up, then ran untill the fuel was gone from the rail, i put line bak on and it wont start, take off and it starts. Now im really lost, because that doesnt make any sense to me. And my return line flows normal. Anybody, because Im at a loss here........
So the car runs without fuel? Awesome! Keep the fuel line detached then.

INFINITE MPG!!!
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Old 01-08-2008, 09:32 PM
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On a more realistic note... which "line" are you removing? Post a pic of it.
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Old 01-09-2008, 03:24 PM
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Well after long thought and some insight from you nismopick, my lady is runny fantastic. I pulled my smog system out, and cleaned out my fuel rail and installed an aftermarket pressure regulator. Seems to have solved the problem. Thanks for the help
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Old 01-09-2008, 04:38 PM
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Is it an aftermarket fuel pressure regulator thats adjustable? im planning on one
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Old 01-14-2008, 11:10 AM
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Yes it is adjustable,
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